[Bug] Reorder basset block checks

[promatik]

The check if the script is already loaded should come first to avoid injecting same script multiple times in the page.

This bug was only happening with basset blocks, while on dev mode.

[pxpm]

Thanks @promatik

I can confirm that:

 @bassetBlock('test')
    <script>
        console.log('test');
    </script>
    @endBassetBlock

    @bassetBlock('test')
    <script>
        console.log('test');
    </script>
    @endBassetBlock

would render the 2 script blocks in the main branch and in this branch it renders only one as expected.

Cheers